Add the continuous loads first
Combine router, modem, laptop, lighting, and other essential watts. Motor-driven appliances need separate startup checks.
UPS labels do not guarantee every device
Desktop PCs, NAS units, and medical equipment can have specific transfer-time and power-quality requirements.
A refrigerator favors 1kWh and higher output
Higher continuous and surge output provides more margin when a refrigerator starts while other essential devices are already running.



